Pyxis SP-710B User manual

SP-710B Water Multimeter
Operation Manual
Jan. 23, 2019
Rev. A
US Patent: 9612221
Pyxis Lab, Inc.
1729 Majestic Dr. Suite 5
Lafayette, CO 80026 USA
www.pyxis-lab.com
© 2017 Pyxis Lab, Inc.
Pyxis Lab Proprietary and Confidential

The information contained in this manual may be confidential and proprietary and is the property of Pyxis Lab, Inc.
Information disclosed herein shall not be used to manufacture, construct, or otherwise reproduce the goods
described. Information disclosed herein shall not be disclosed to others or made public in any manner without the
express written consent of Pyxis Lab, Inc.
Limited Warranty
Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its option, repair or
replace instrument components that prove to be defective with new or remanufactured components (i.e.,
equivalent to new). The warranty set forth is exclusive and no other warranty, whether written or oral, is expressed
or implied.
Device Warranty Term
The Pyxis warranty for SP-710 and SP-710B ‘device not including pH-ORP module’ term is thirteen (13) months from
original shipment from Pyxis. In no event shall the standard limited warranty coverage extend beyond thirteen (13)
months from original shipment date.
pH/ORP Module Warranty Term
The Pyxis warranty term for the pH/ORP module is six (6) months ex-works. This is a consumable module to SP-710
and SP-710B and will require scheduled replacements. Pyxis Lab recommends replacement of this module on a basis
of every 9-12 months for preventative maintenance. In no event shall the standard limited warranty coverage
extend beyond (6) months from original shipment date.
Warranty Service
Damaged or dysfunctional instruments may be returned to Pyxis for repair or replacement. In some instances,
replacement instruments may be available for short duration loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical competency
and performance effective at the time of delivery. All service interventions are to be reviewed and authorized as
correct and complete at the completion of the service by a customer representative or designate. Pyxis warrants
these services for 30 days after the authorization and will correct any qualifying deficiency in labor provided that the
labor service deficiency is exactly related to the originating event. No other remedy, other than the provision of labor
services, may be applicable.
Repair components (parts and materials), but not consumables, provided in the course of a repair, or purchased
individually, are warranted for 90 days ex-works for materials and workmanship. In no event will the incorporation
of a warranted repair component into an instrument extend the whole instrument’s warranty beyond its original
term.
Warranty Shipping
A Repair Authorization Number (RA) must be obtained from Pyxis Technical Support before any product can be
returned to the factory. Pyxis will pay freight charges to ship replacement or repaired products back to the customer.
The customer shall pay freight charges for returning products to Pyxis. Any product returned to the factory without
an RA number will be returned to the customer.
Pyxis Technical Support
Contact Pyxis Technical Support at [e-mail] or 1-866-203-8397 (Mo-Fri 7:00AM-5PM MT)

Pyxis SP-710B Multimeter Operation Manual 3
Table of Contents
1Introducing the Pyxis SP-710B Multimeter...................................................................................5
1.1 Features of the Pyxis SP-710B.......................................................................................................5
1.2 Specifications ................................................................................................................................6
1.3 Unpacking the Pyxis SP-710B........................................................................................................6
1.4 Standard Accessories ....................................................................................................................6
1.5 Optional Accessories.....................................................................................................................7
1.6 Dual Function Seal for the pH/ORP Cell........................................................................................7
2Using the Pyxis SP-710B..............................................................................................................8
2.1 Battery Installation........................................................................................................................8
2.2 Turning the SP-710B ON and OFF .................................................................................................9
2.3 Turn on the pH/ORP Module Power.............................................................................................9
2.4 Using the SP-710B Control Keys..................................................................................................10
3Multiple Parameter Measurement............................................................................................10
3.1 PTSA and Conductivity Measurement ........................................................................................10
3.2 Fluorescein Measurement..........................................................................................................11
3.3 pH and ORP Measurement .........................................................................................................11
3.4 Temperature Measurement .......................................................................................................13
3.5 Conductivity Temperature Compensation..................................................................................13
3.6 High Color and Turbidity Warning ..............................................................................................13
3.7 pH Measurement Principle.........................................................................................................13
3.8 ORP Measurement Principle.......................................................................................................14
4Calibrating the SP-710B.............................................................................................................14
4.1 PTSA Standalone Calibration (2 point with zero)........................................................................15
4.2 Combined Calibration Procedure................................................................................................15
4.3 Standard Conductivity Calibration (500, 1000, 2500, or 5000 µS) .............................................17
4.4 User-Defined Conductivity Calibration Procedure......................................................................18
5pH and ORP Calibrations...........................................................................................................19
5.1 pH Electrode Calibration.............................................................................................................19
5.1.1 One-Point Calibration .........................................................................................................20
5.1.2 Second-Point Calibration ....................................................................................................20
5.1.3 Third-Point Calibration........................................................................................................20
5.2 ORP Calibration...........................................................................................................................21
6Fluorescein Calibration .............................................................................................................22
7Device Information and Diagnosis.............................................................................................24
8Device Maintenance.................................................................................................................25
9Replacing the pH/ORP module (Part #50313).............................................................................25
9.1 Module Replacement..................................................................................................................25
9.2 Bluetooth Pairing Your pH/ORP Module to SP-710B..................................................................27
10 Bluetooth Connection of SP-710B to Devices.............................................................................27

Pyxis SP-710B Multimeter Operation Manual 4
11 Calibrate ST-500 with SP-710B ..................................................................................................28
12 REGULATORY APPROVAL ..........................................................................................................30
13 Appendix. Cleaning Kit..............................................................................................................31

Pyxis SP-710B Multimeter Operation Manual 5
1Introducing the Pyxis SP-710B Multimeter
The Pyxis SP-710B is a handheld multimeter that measures five key parameters. It is a cuvette-
less device. Less than 5 ml water sample is needed to fill the two sample cells for the
measurement.
•pH
•Conductivity
•PTSA (Pyrene Tetrasulfonic acid Tetra Sodium)
•Fluorescein
•ORP
•Temperature
1.1 Features of the Pyxis SP-710B
The SP-710B includes the following features:
•Breakthrough technology combining PTSA/fluorescein with conductivity and pH/ORP in a
single rugged meter.
•The PTSA measurement uses custom signal processing algorithms to compensate for sample
color and turbidity interference.
•Modular pH/ORP design with extra-large junction capacity providing increased service life.
•Easy replacement of the pH/ORP module without the need to open the meter enclosure.
•The pH/ORP module can be used wirelessly and independent of the main module.
•Long battery life: 10,000+ readings.
•Self-diagnosis during calibrations.

Pyxis SP-710B Multimeter Operation Manual 6
1.2 Specifications
Specifications are subject to change without notice. Contact Pyxis ([e-mail]) for
an updated specification list.
Item
Specification
Analysis
PTSA
Fluorescein
0-300 ppb, ±1 ppb or 1% precision
0-600 ppb, ±0.2 ppb for 0-50 ppb or 1% precision
Conductivity
1-15,000 µS/cm with ATC. ±1% or ±1 µS/cm precision
pH
0-14 with ATC, ±0.01 pH unit precision
ORP
±1500 mV, ±1 mV precision
Temperature
0-70° C (32-160 °F), ±0.1 °C (±0.2 °F)
Storage Temperature
-10 °C –50 °C (-4 - 140° F)
Operational Temperature
0 °C –40 °C (32 - 104° F)
Sensor Module
pH/ORP, replaceable –recommended every 9-12 months
Typical Sensor Life
pH/ORP - 1 year
PTSA/Conductivity - 5 years
Protection Grade
IP67, Fully Dustproof & Waterproof
Regulation
CE
Display
Color LCD, Visible Under Direct Sunlight
Power Supply
4 AA alkaline batteries
Typical Battery Life
10,000 readings
Dimension (L x W x H)
208 x 80 x 45 mm (8.19 x 3.15 x 1.77 inches)
Weight
520 g (1.15 lbs) batteries excluded
1.3 Unpacking the Pyxis SP-710B
Remove the instrument and accessories from the shipping container and inspect each item for
any damage that may have occurred during shipping. Verify that all items listed on the packing
slip are included. If any items are missing or damaged, please contact Pyxis Customer Service at
[e-mail] shipping and storage after production, a sponge wetted with the
KCl based pH storage solution is placed in the pH/ORP cell. You may also observe some residual
dry storage solution leaving white potassium chloride crystal in the surrounding areas of the cell.
Please rinse the cell with a water sample before use.
1.4 Standard Accessories
The following accessories are included in the SP-710B package:
•Four (4) AA alkaline batteries
•Bluetooth USB adapter (Part # MA-NEB)

Pyxis SP-710B Multimeter Operation Manual 7
The full instrument manual is available for download at www.pyxis-lab.com/support.html
1.5 Optional Accessories
The following optional accessories can be ordered from Pyxis Customer Service,
[email protected]m or Pyxis EStore at www.pyxis-lab.com/shop
Accessory
Item number
Replacement pH/ORP Module - Bluetooth
50315
Carrying Case for SP-710B
MA-700
100 ppb PTSA + 1000 S/cm (KCl) combined standard
PTSA-1010
220 mV ORP Calibration Standard
ORP-220
100 ppb PTSA Calibration Standard
PTSA-100
pH 4-7-10 Calibration Combination Kit
57007
1000uS Conductivity Calibration Standard
57008
50 ppb fluorescein calibration standard
FLUO-50
250 ppb fluorescein calibration standard
FLUO-250
500 ppb fluorescein calibration standard
FLUO-500
1.6 Dual Function Seal for the pH/ORP Cell
The SP-710B pH/ORP seal (Figure 1) has two functions:
•When the multimeter is in storage, the rubber seal seals the pH/ORP cell, maintaining a
moist environment for the electrodes.
•The seal contains a permanent magnet. When being brought close to the front end of the
module, the seal turns on pH/ORP module power.

Pyxis SP-710B Multimeter Operation Manual 8
Figure 1. Seal in the open position
Please fill the pH/ORP cell with 1 ml of the pH 4 buffer solution or pH electrode storage solution
at all times when not using the pH/ORP cell. NOTE - The sponge soaked with the pH storage
solution in the pH/ORP helps prolong the life of the pH/ORP module.
2Using the Pyxis SP-710B
2.1 Battery Installation
The main module of the SP-710B is powered by four AA alkaline batteries. Typical battery life is
10,000 measurements, or 10 months. When the battery capacity is critically low, the SP-710B
displays a LOW BATTERY warning for five seconds, and then automatically turns off.
The SP-710B does not turn itself on automatically after the new battery installation. To turn on
the SP-710B after new battery installation, press the OK key momentarily and release.
Maintaining SP-710B date and time during battery installation: The SP-710B has a calendar
timer. To prevent the calendar from being reset to the default date and time (01/01/1970,
00:00:00), install the four new batteries within four minutes after the old batteries are removed
from the battery compartment.
The SP-710B date and time is synchronized with your PC automatically when connected with
uPyxis© app via Bluetooth adapter provided.

Pyxis SP-710B Multimeter Operation Manual 9
The SP-710B battery compartment, shown in Figure 2, is on the back side of the instrument.
Batteries are held in place by a cover secured with two Phillips-head screws.
Figure 2. The SP-710B battery compartment
Use the following procedure to install new batteries:
1. Remove the battery compartment cover by loosening the two screws.
2. Remove the old batteries and dispose of properly.
3. Following the positive and negative terminal signs in the compartment bottom, snap four
new AA alkaline batteries firmly into the battery holder.
4. Replace the battery compartment cover and ensure that the sealing O-ring is lying flat on
the battery holder. NOTE: Failure to properly seat the O-ring may result in water damage
to the meter.
5. Fasten the two screws.
2.2 Turning the SP-710B ON and OFF
To turn on the SP-710B:Press the OK key momentarily and release.
To turn off the SP-710B:Press and hold the OK key for three seconds. Release the OK key when
the LCD display turns off.
The SP-710B turns itself off after 30 seconds without user interaction detected. This is done to
conserve battery life.
2.3 Turn on the pH/ORP Module Power
The module has a permanently sealed 3.7 V lithium battery. The module is turned on by rotating
the pH/ORP seal to touch the front face of the module. A sealed magnet within the rubber seal

Pyxis SP-710B Multimeter Operation Manual 10
will trigger the module power circuit. The pH/ORP module will turn itself off when either
commanded by the main SP-710B module or automatically based on the idle time limit. The
purpose for this design is to extend battery life.
If pH/ORP measurement is not needed, the module does not need to be turned on.
2.4 Using the SP-710B Control Keys
The SP-710B has three control keys, as shown in Figure 3. The left ( < ), right ( > ), and OK keys
are used to launch actions indicated on the LCD screen directly above the keys. Note that the LCD
screen is not a touch-enabled device; the labels above the keys indicate the function associated
with the keys, and functions can be changed in different operation modes.
Figure 3. Control keys and associated functions
3Multiple Parameter Measurement
3.1 PTSA and Conductivity Measurement
When powered on, the SP-710B is in the measurement mode of PTSA and Conductivity (as
shown in Figure 3 above).
A water sample should be transferred to the PTSA cell using a pipette, or the cells can be filled
directly from a sample bottle.
Rinse cells before measurement. Before beginning a measurement, use some of the sample water
to rinse the cells at least three times.
Allow five seconds for the SP-710B to reach stable readings. The time required to reach a stable
reading may be slightly longer if the water sample temperature is significantly different than the

Pyxis SP-710B Multimeter Operation Manual 11
environmental temperature at which the SP-710B had been equilibrated (stored). The values will
be displayed in white with a blue background if a stable value is reached (Figure 3).
For a sample with conductivity in the range of 100 to 6000 S/cm, the measured value should be
stabilized in the range of 98–102 to 5940–6060 S/cm, respectively. For a sample containing 100
ppb PTSA, the measured PTSA should be stabilized within the range of 98–102 ppb.
3.2 Fluorescein Measurement
The default measurement mode is for PTSA and conductivity. Press Measure (the < key) to
launch the measurement selection menu and click Measure again to highlight Fluorescein. Press
the OK key to launch the fluorescein measurement page (Figure 4).
Fill the PTSA/Conductivity cell with the sample water. The fluorescein concentration will be
displayed as shown in Figure 5.
Figure 4. Select fluorescein measurement
Figure 5. Fluorescein measurement screen
3.3 pH and ORP Measurement
Follow the following steps to measure pH and ORP:
1. Lower the rubber seal down to touch the front face of the pH/ORP module (Figure 4). This is
to power on the module. The indicator light of the module will be green and flashing when
powered on. After the module is turned on, the seal can be positioned anywhere desired. If
the module battery capacity is low, the indicator light will flash red.
2. Rinse the pH/ORP cell and fill in the sample water.
3. Press Measure (the <key). A selection menu will be shown as in Figure 6. Press Measure
again to highlight pH/ORP.Press OK to start pH and ORP measurement. The pH and ORP
values will be updated every two seconds. The values will be displayed in white with a blue
background if a stable value is reached (Figure 7).

Pyxis SP-710B Multimeter Operation Manual 12
OFF/CLOSED POSITION POWERED ON POSITION
Figure 6. Turn on pH/ORP module with the seal
If step 3 is carried out to launch pH/ORP measurement from the main module without turning on
the pH/ORP module first (i.e., skipping step 1), an instruction message will be promoted on the
screen showing how to turn on the pH/ORP module (Figure 7). In this case, please turn on the
pH/ORP module by lowering the seal according to the message shown.
Figure 7. Select pH/ORP
measurement
Figure 8. Display pH and ORP
values
Figure 9. Instruction to turn on
pH/ORP module
A erroneous pH value could be obtained if the module has been stored dry without the
protection of the pH electrode storage solution for a long period. In this case, please fill the
module cell with a pH storage solution to wet the electrode for 30 minutes before use. If these
solutions are not available, please use the sample water to hydrate the electrode for 30
minutes.

Pyxis SP-710B Multimeter Operation Manual 13
3.4 Temperature Measurement
The SP-710B has two platinum RTDs located in the PTSA/Conductivity cell and the pH/ORP cell.
The temperature sensors are individually calibrated in the factory and does not need to be
calibrated during use. The temperature values measured is used in the conductivity temperature
compensation and in converting the measured cell potential to the pH value at the sample
temperature.
3.5 Conductivity Temperature Compensation
The displayed conductivity value is automatically corrected to the nominal value at the reference
temperature 25.0 °C using the sample temperature measured. The commonly used linear
correction equation is used:
Conductivity at 25 °C = (Conductivity at Tmeasured) / [1 + 0.02(Tmeasured –25)],
where Tmeasured is the sample temperature in degrees Celsius.
3.6 High Color and Turbidity Warning
The SP-710B has extra channels to measure sample turbidity and color to automatically
compensate for sample color and turbidity interference. If sample turbidity and color values
determined are too high and beyond the compensation range, a PTSA measurement warning is
displayed. In this case, the sample should be pre-filtered for PTSA measurement.
3.7 pH Measurement Principle
The SP-710B uses the standard electrochemical cell for the pH measurement. The cell consists of
a glass electrode and an Ag/AgCl reference electrode. Potassium chloride (KCl) electrolyte filling
gel is sealed in the Ag/AgCl electrode.
The amount of reference electrolyte in the SP-710B is significantly larger than that used in a
common laboratory pH electrode. This reduces the chance of the filling solution being diluted or
contaminated and increases the electrode life.
The pH value is calculated from the measured cell potential (EMF in mV):
pH = EMF / S(T) + pHo
S(T) in the above equation is the calibration slope and is theoretically equal to:
0.1986(T + 273.15)
where T is temperature in degrees Celsius.
S(T) has a theoretical value of 59.17 mV at 25 oC. pHois the calibration intercept. The calibration
slope S(T) at the nominal temperature 25.00 oC and the intercept pHo are determined in the two-

Pyxis SP-710B Multimeter Operation Manual 14
point or three-point calibration procedure. pHo is determined as well in the singe-point pH 7.00
calibration.
The temperature value measured by the SP-710B is used in the above equation to calculate the
pH value at the measurement temperature. Note that the temperature compensation involved
in the pH value calculation is quite different from that in the conductivity measurement. The
temperature-compensated conductivity value is a would-be value at the reference temperature
25 oC, while the pH value displayed by the SP-710B is the true pH value atthe sample temperature.
3.8 ORP Measurement Principle
The SP-710B measures the sample ORP with the platinum electrode and the Ag/AgCl reference
electrode in the pH/ORP cell. The pH measurement and the ORP measurement share the same
reference electrode. Reporting an ORP value without specifying the reference scale has no
meaning. The ORP value reported by the SP-710B could be referenced to the standard hydrogen
electrode (SHE), i.e., in the unit of Eh, or an Ag/AgCl electrode. The value displayed by the SP-
710B depends on the ORP value of the ORP standard used in the calibration.
If the ORP value of the standard is referenced to the standard hydrogen electrode (SHE), the ORP
value reported by the SP-710B is SHE-based, i.e., in the unit of Eh. If the ORP value of the standard
is referenced to the Ag/AgCl (3M KCl) electrode, the ORP value reported by the SP-710B is
referenced to the same, commonly noted as (Ag/AgCl, 3M KCl).
The ORP electrode is calibrated using the Zobell’s standard using the value of 221 mV at 25 o C
before shipping. The default ORP scale of the SP-710B before a user calibration is the Ag/AgCl
(3M KCl).
It is difficult to measure ORP of a field sample accurately and precisely. ORP of water samples with
low conductivity and low redox buffer capacity, such as unchlorinated surface water, is even more
difficult to measure. If the SP-710B is exposed to an extremely high (>600 mV) or extremely low
(< -200 mV) ORP sample, rinse the pH/ORP cell excessively when switching to measure a lower or
higher redox buffer capacity sample is necessary.
The dissolved oxygen in the sample can contribute to the ORP value measured. To measure a
sample that has not be equilibrated with the ambient air, a slow and small upward drifting to
more positive ORP value is normal.
For a typical cooling water sample treated with oxidizing biocides, a ± 20 mV accuracy and ± 10
mV precision can be expected.
4Calibrating the SP-710B
The PTSA, fluorescein, pH, ORP, and conductivity measurements can be calibrated separately
using the corresponding standards.
PTSA calibration requires the 100, 200, or 300 ppb PTSA standard solution. A standard with
conductivity value 500, 1000, 2500, or 5000 µS can be used to calibrate conductivity. Optionally,

Pyxis SP-710B Multimeter Operation Manual 15
you can use a standard with any conductivity value in the range of 500 to 5000 µS, such as the
commonly used 1412 (or 1413) µS standard, to calibrate the SP-710B. For convenience, the SP-
710B can be calibrated using a combined standard with 100 ppb PTSA + 1000 µS KCl conductivity
available from Pyxis. Fluorescein calibration requires the 50, 250, and 500 ppb fluorescein
standards.
4.1 PTSA Standalone Calibration (2 point with zero)
It is recommended that you use the PTSA standalone calibration procedure if you want to achieve
higher accuracy for low range PTSA measurements (< 20 ppb). The Combined PTSA/Conductivity
Calibration procedure yields the PTSA calibration slope only and does not change the zero point.
To use the PTSA standalone calibration procedure:
1. Rinse sample cell with DI water, and then fill the sample cell with DI water.
Note: In an emergency, “non-PTSA” water, such as city water, can be used.
2. Power the SP-710B on by pressing the OK key. Allow 5-10 seconds for meter to stabilize.
3. A screen like Figure 11 appears. The unit is actively reading and displaying both PTSA and
Conductivity.
4. Press Calib (the <key). Press OK to select PTSA (alone) calibration, as shown in Figure 12
5. Press Zero to set the zero point, as shown in Figure 13.
6. After successful zero set, a checkmark symbol appears next to Click Zero Button to confirm
success. The screen also updates to show the Slope steps, as in Figure 14. The Cycle command
replaces the Zero command on the black bar, and the possible PTSA selection is displayed in
red. The default is 100 ppb:
7. Rinse the sample cell out at least twice with the desired PTSA standard, and with the
measurement cell near full.
8. If the 100 ppb PTSA default is not the desired PTSA for calibration, press Cycle to cycle among
the PTSA standards 100-200-300 ppb. The value in red updates as the setting is being changed.
9. Press Slope to set the slope of the standard desired and complete PTSA calibration. If
calibration is successful, the screen updates with a second checkmark for the Slope setting as
shown in Figure 15, and the message Calibration Succeed appears.
10. Press Exit to return to the measurement screen. Slight variance in the PTSA value is
acceptable. If you press Exit before the second checkmark appears, the calibration will not
be completed and must be re-done.
4.2 Combined Calibration Procedure
The combined 100 ppb PTSA and 1000 µS calibration requires the Pyxis PTSA-1010C combined
standard.

Pyxis SP-710B Multimeter Operation Manual 16
When Cond (conductivity) calibration is selected, the <or >keys can be used to cycle to different
conductivity calibration modes. With each press various elements of the display update, such as
the calibration title, the type (“Target”), and the black bar.
1. Rinse sample cell with the Combined Standard and close the light shield.
2. Power on by pressing the OK key. Allow 5-10 seconds for meter to stabilize.
3. Press Calib (the >key) to launch the calibration selection screen (Figure 12). Press Calib again
to select Cond (conductivity) calibration. Press OK to start the calibration procedure. The
default conductivity calibration screen is the Combined Calibration (Figure 16). This will
calibrate both Conductivity (at 1000 µS) and PTSA (at 100 ppb) when using the Pyxis PTSA-
1010C combined standard.
4. Ensure the meter is filled with the Combined Standard and press Calib to confirm the
desired calibration. A confirmation popup appears as in Figure 17.
5. Press the OK key to execute both conductivity and PTSA calibrations (skip steps 6 and 7).
6. Or, press Cancel (the <key) to return to the conductivity calibration type selection screen.
7. Or, press Exit (the >key) to abandon calibration.
8. If Combined Calibration is successful, the measured field updates to the target conductivity
value (1000 µS), or very close. A checkmark shows. The screen appears as in Figure 18.
9. After about one second, if the PTSA calibration is successful, the PTSA value is also displayed
in the measured section below the conductivity value, and a checkmark appears. A small
variance is acceptable. The message “Calibration Succeed” appears in red, as in Figure 19.
10. After successful calibration, press and hold Calib for three seconds to return to the basic
measurement screen. Return is not automatic, except through a power-off cycle.
Figure 10. PTSA measurement
screen
Figure 11
Figure 12

Pyxis SP-710B Multimeter Operation Manual 17
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
4.3 Standard Conductivity Calibration (500, 1000, 2500, or 5000 µS)
Example based on 1000 µS:
1. Rinse sample cell with the desired conductivity standard.
2. Power on by pressing the OK key. Allow 5–10 seconds for the meter to stabilize.
3. Press Calib (the >key) to launch the calibration selection screen (Figure 12). Press Calib again
to select Cond (conductivity) calibration. Press OK to start the calibration procedure. A screen
like Figure 16 appears. This is the default combined Calibration mode, which requires the Pyxis
combined standard.
4. Use the >key to cycle to the desired calibration, for example, 1000 µS (Figure 20). The
Standard Conductivity selections are 500, 1000, 2500, and 5000 µS.
5. Press Calib to confirm the specific conductivity calibration desired. The screen updates as
shown in Figure 21.

Pyxis SP-710B Multimeter Operation Manual 18
6. To start the calibration, press OK control key (skip steps 9 and 10).
7. Or, press Cancel (the <key) to return to the Conductivity calibration selection screen (Figure
21). You can change the conductivity calibration type by using the >or <control keys.
8. Or, press Exit (the >key) to abandon calibration.
9. After successful conductivity calibration, the meter reads the sample and displays the value
in the measured section. A slight variance from the target is acceptable. A message displays
in red: “Calibration Succeed.”The meter display appears like Figure 22.
10. After successful calibration, press and hold Calib for three seconds to return to the basic
measurement screen. Return to this mode is not automatic except through a power-off cycle.
4.4 User-Defined Conductivity Calibration Procedure
1. Rinse sample cell with desired conductivity standard.
2. Power on by pressing the OK key. Allow 5-10 seconds for meter to stabilize.
3. Press Calib (the >key) to launch the calibration selection screen (Figure 12). Press Calib again
to select Cond (conductivity) calibration. Press OK to start the calibration procedure. A screen
like Figure 16 appears. This is the default combined Calibration mode, which requires the Pyxis
combined standard.
4. Press the <key. A screen like Figure 23 appears.
5. If the displayed Target numeric value is not that the value you want, use the keys
labeled –and +(the <and >keys) to adjust the value as desired. Holding a key down scrolls
the values at a faster rate. Once the value is as desired, press Set to confirm the numeric
value to be used. The black bar updates as in Figure 24 (The label above the OK key now
changes to Calib from Set). Press Calib. The screen updates to Figure 25 with the confirmation
popup.
6. Press OK to execute the User Defined Conductivity calibration (skip steps 8 and 9).
7. Or, press Cancel to return to the User Defined Calibration (as in Figure 23), where the
desired User Defined calibration numeric value can be changed.
8. Or, press Exit to abandon calibration.
9. After successful User Defined calibration, the meter reads the sample value and displays the
value in the measured section. A message displays in red “Calibration Succeed.”
10. After successful calibration, press Calib for three seconds, to return to the basic measurement
screen. Return to this mode is not automatic except through a power-off cycle.
If the user defined conductivity calibration mode is cycled to accidently, the < key and > key cannot
be used to cycle out this mode. Please press Set (the OK key), and then press and hold the OK key
for three seconds to exit this mode. Or abandon the user defined calibration at step 8 above.

Pyxis SP-710B Multimeter Operation Manual 19
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
5pH and ORP Calibrations
The commonly used pH 4.00, 7.00, and 10.00 buffer standards can be used to calibrate the SP-710B
pH measurement.
Unlike the pH calibration, ORP calibration procedure and the calibration standards are not
standardized by the industry or government institutions. We recommend that you use Zobell’s ORP
standards (or Pyxis ORP-220) to calibrate the SP-710B and pay attention to the reference electrode
on which the ORP value is referenced. The reference information must be specified by the standard
supplier.
5.1 pH Electrode Calibration
The SP-710B software is designed to provide a flexible calibration procedure. You can start with the
one-point pH 7 calibration and progressively add a second point and a third point calibration with
the pH 4 buffer and the pH 10 buffer. This allows you to choose a procedure based on the need of
measurement accuracy and the target pH range.

Pyxis SP-710B Multimeter Operation Manual 20
Starting the pH calibration: After the meter and the pH/ORP module are powered on, press
Measure to switch to the pH measurement page. Press Calib to start the pH calibration procedure.
5.1.1 One-Point Calibration
Rinse the pH/ORP cell three times with the pH 7 buffer and fill the cell with the pH 7 buffer.
Press pH-7 (the < key) to start one-point calibration. A checkmark after Click pH-7 is displayed if
the calibration succeeds (Figure 26). Otherwise a warning message is displayed.
5.1.2 Second-Point Calibration
When the one-point pH 7 calibration is complete, press Exit to exit, or continue to the pH 4 or pH
10 calibration. If a second buffer is added into the cell, the SP-710B automatically determines the
buffer pH and displays the determined buffer pH value for confirmation.
If you choose the pH 4 buffer to do the second-point calibration, the pH 4 buffer is identified and
the value 4.00 is shown. Press Calib to complete the pH 4 calibration. A checkmark after Click
pH-4 is displayed if the calibration succeeds (Figure 27). Otherwise a warning message is
displayed.
Alternatively, you can use the pH 10 buffer for the second-point calibration.
5.1.3 Third-Point Calibration
When the second-point calibration is complete, press Exit to exit, or continue to a third-point
calibration. If you have used the pH 4 buffer in the second-point calibration, you must use the pH
10 buffer for the third-point calibration.
Rinse the pH/ORP cell three times and fill the cell with the pH 10 buffer. The pH 10 buffer is
automatically identified. Press Calib to complete the third-point calibration. A checkmark after
Click pH-10 is displayed if the calibration succeeds (Figure 28). Otherwise a warning message is
displayed. Press Exit to finish the final calibration process.
Figure 26
Figure 27
Figure 28